Phase Behavior and Mesophase Structures of 1,3,5‐Benzene‐ and 1,3,5‐Cyclohexanetricarboxamides: Towards an Understanding of the Losing Order at the Transition into the Isotropic Phase
作者:Andreas Timme、Roman Kress、Rodrigo Q. Albuquerque、Hans‐Werner Schmidt
DOI:10.1002/chem.201103216
日期:2012.7.2
and XRD measurements revealed that columnar H‐bonded aggregates were still present in the isotropic phase. At the clearing transition, mainly the lateral order was lost, whilst shorter columnar aggregates still remained. A thorough understanding of the phase behavior and the mesophase structure is relevant for selecting processing conditions that use supramolecular structures in devices or as fibrillar
超分子化学中最简单,最通用的基元之一是基于1,3,5-苯三甲酰胺。核心结构的变化和侧向取代基结构的细微变化控制着自组装并决定了相行为。本文中,我们提供了一系列包含直链和支链烷基取代基的1,3,5-苯和1,3,5-环己烷甲酰胺的相行为和中间相结构的全面比较。取决于取代基,形成了不同的结晶相,塑性结晶相和液晶相。在相对罕见的柱状向列型(N Ç)相仅在含有线性烷基取代基的环己烷基三酰胺中观察到。在液晶超分子系统中,最基本的兴趣是从介晶态到各向同性态的转变,尤其是如何降低阶数的问题。温度相关的红外光谱和XRD测量表明,各向同性相中仍存在柱状H键结合的聚集体。在清理过渡时,主要失去了侧向顺序,而仍然保留了较短的柱状骨料。对相行为和中间相结构的透彻了解与选择在器件中使用超分子结构或用作原纤纳米材料的加工条件有关。